Vibration damping for crack detection in composite laminates

The detection of damage in composite laminates is a vital step in allowing their wider use in critical applications. Measurement of specific damping capacity (SDC) is a useful potential method for damage detection. The work reported in this paper consists of measurements and analysis of SDC of composite beams in flexure. Beams have been tested before and after the introduction of damage using quasi-static loading or fatigue. The damage mechanisms and location of the damage in the woven laminates is deduced from comparison of dynamic results with the dynamic response from the cross-ply laminates containing well characterized damage. The results indicate that measurement of SDC is a promising technique for detection of initial damage in woven fabric composites.

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